types of leaf lamina

Simple leaves are lobed or divided but do not form distinct leaflets. The three components of a leaf are the leaf blade or lamina, petiole, and stipule. Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. Among the different parts of a plant, the leaf is the most essential. There is no branching among the veins. Leaves may be categorized as simple or compound, depending on how their blade (or lamina) is divided. In a compound leaf, the leaf blade is completely divided, forming leaflets, as in the locust tree. Legal. Simple – A life with undivided lamina is known as simple leaf. Every life on the earth is directly or indirectly dependent on plants. Few plants require nitrogen for their development. R e t i c u l a t e Venation: This type of venation is … Leaf tendrils exist in plants with weak stems. Compound Leaf. (i) Identify the plant which has compound leaves: (a) Banana (b) Banyan (c) Mango (d) Rose Answer Rose (ii) Which one of the following is not an insectivorous plant— (a) Pitcher plant (b) Venus flytrap (c) Bladderwort (d) Cactus Answer Cactus (iii) This leaf shows parallel venation: (a) Banana (b) Mango (c) Banyan (d) Guava Answer Banana (iv) The point on the stem from where the leaf arises is: (a) Petiole (b) Lamina (c) Node (d) Trunk Answer Node (v) Which one of the following is essential for photosynthesis: … Ovate Type: They are oval or egg-shaped in their structure. For eg., Australian Acacia. Ramal arise from main stem and breaches 46. A simple leaf may be incised to any depth but not down to the midrib or petiole. Missed the LibreFest? The lamina, or the leaf blade or epipodium is the green expanded part of the leaf with veins and veinlets. Eg., Neem. ... Types of Leaf Forms. The parenchymatous cells of these leaves have large vacuoles filled with hydrophilic colloid. Figure \(\PageIndex{1}\): Simple and compound leaves: Leaves may be simple or compound. Each leaf typically has a leaf blade called the lamina, which is also the widest part of the leaf. What are the different shapes of the leaves? Leaves are the main source of photosynthesis, the process by which the plants feed themselves. Guava plants. How are the veins of the leaves important? The spines act as defensive structures. Simple leaf with palmately lobed lamina is found in Ricinus, Passiflora, Cucurbita, Carica, Gossypium. What are the different types of blade of a leaf? There are two different types of leaves – simple and compound leaves. The following types of leaf margin are recognised : l. There are two basic forms of leaves that can be described considering the way the blade (or lamina) is divided. Watch the recordings here on Youtube! When only a single leaf develops at each node alternatively, it is an alternate type of phyllotaxy.E.g. types of leaf based on leaf lamina. The two types of compound leaf are: 1. Eg., Guava leaves. The succulent and thick leaves particularly adapt to water storage. We know leaves are specialised to perform photosynthesis. Compound leaves are a characteristic of some families of higher plants. They protect the auxiliary bud present in their axil. Some tree species make things more interesting by displaying more than one type of leaf … Cuneate bases are sharp-pointed, with an angle less than 45 degrees between opposite sides which form a wedge or triangular shape that tapers to a narrow region at the point of attachment of lamina with petiole. A few plants have their leaves modified into needle-like structures known as spines. Venation is the arrangement of veins and veinlets on the lamina or surface of the leaf. Your email address will not be published. Leaves produced are progressively shorter, narrow, and brittle in texture; these bunch together at the top and hence provide the name of … In angiosperms leaves commonly have a pair of structures known as stipules, which are located on each side of the leaf base and may resemble scales, spines, glands, or leaflike structures. This is known as phyllode. The base of a leaf is the lower part of the lamina, where it is attached to the petiole or stem. This occurs by the opening of stomata present in the leaves. Leaf Its Characteristics Functions Types Of Venation Vein Density As A Function Of Lamina Position For Leaves Growing At The Scientific Diagram The veins of the leaves are provided with vascular tissues called xylem and phloem. Leaves are, however, quite… Read More Removal of excess water from the xylem at the edges of the leaves when the stomata are closed is known as guttation. Leaves are a site of photosynthesis. Centric Type: They are cylindrical and hollow. There are various types of leaves, each with its own shapes. (iii) Generally there is always an axillary budin the axil of a leaf. 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When more than two leaves develop at the nodes to form a whorl of leaves, it is called whorled phyllotaxy. Leaves may be simple or compound. Biology Morphology of Flowering Plants part 13 (Leaf: parts-lamina, Petiole, Stipule) CBSE class 11 XI Photosynthesis is the major function performed by leaves. There are two basic forms of leaves that can be described considering the way the blade (or lamina) is divided. Shape of Leaf Lamina: Linear: Long and narrow leaf, e.g., many grasses. Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. ... Chapter 5 Morphology Of Flowering Plants Parts Functions Venation Phyllotaxy And Types Leaf Notes Study Score Learn About Leaves Science For Kids Radical present near the roots 2. In such plants, the leaves are modified to catch and digest insects. Pinnately compound leaves take their name from their feather-like appearance; the leaflets are arranged along the middle vein, as in rose leaves or the leaves of hickory, pecan, ash, or walnut trees. in many grasses, Polyanthes tuberosa (Amaryllidaceae) etc. Types of leaf - Leaves are of two types. In simple leaves, the lamina is continuous. The upper leaflets of Pisum sativum get modified into tendrils. Thus they play a major role in the survival of a plant. Structure of leaf (1) A leaf consists mainly of two parts lamina … Spatulate Type: They have shapes resembling spatulas or spoons. China rose. Whereas, in a compound leaf the leaves are divided into distinct leaflets and each leaflet has a small petiole. Leaves may be simple or compound. Let’s learn more about the morphology of leaves, parts of a leaf, different types of leaves and their modifications. The structure of a leaf is described below in detail : Generally, leaf base, petiole, and lamina, together form the main parts of a  leaf. In some plants, the terminal leaflets of leaf get modified into hook-like structures that help them in climbing. Pinnately compound leaves 2. Leaf location 47. Transpiration is the removal of excess water from the plants into the atmosphere. Not every species produces leaves with all of these structural parts. There are three main parts of a leaf – Leaf base, leaf lamina, and petiole. It may be a part of a larger structure. The leaflets are borne on a common axis and they do not bear any axillary buds in their axils. Generally, there are two types of venation: There are two broad categories of leaves – simple and compound, which are further classified into different groups based on their shape, size, their arrangements on the stem,  leaves of flowering and non-flowering plants, and various other physical attributes. A typical plant leaf (Different parts and types) November 15, 2019 Sushil Humagain 0. (Pinaceae). Palmately compound leaves. (iv) It is exogenous in originand develops from the swollen leaf primordium of the growing apex. The leaflets do not contain axillary buds. Leaf margins-The shape of the margin of leaf lamina or leaf blade is dependent on the extent to which the leaf blades are subject to varieties of incisions, cuts or irregularities or completely free from them. Leaf Definition. There are two different types of leaves – simples leaves and compound leaves. The compound leaves are further sub-divided into the following types of leaves: In a palmately compound leaf, the leaflets are attached at the tip of the petiole. Eg., Bignonia unguiscati. Therefore, they store water and nutrients. The leaflets of palmately-compound leaves radiate outwards from the end of the petiole. Each leaflet is attached to the rachis (middle vein), but may have its own stalk. For example, tendrils of peas, spines of cacti, onion bulb, leaves of insectivorous plants, etc. Typically, a leaf consists of a broad expanded blade (the lamina), attached to the plant stem by a stalklike petiole.In angiosperms leaves commonly have a pair of structures known as stipules, which are located on each side of the leaf base and may resemble scales, spines, glands, or … The patterns of arrangement of leaves on the stem are called Phyllotaxy. A leaf diagram representing the parts of a leaf. blades are slightly broader, e.g. In leaf: Leaf morphology …a broad expanded blade (the lamina), attached to the plant stem by a stalklike petiole. These are thin, membranous structures, without stalks, brownish or colourless in appearance. Simple leaf and compound leaf are two types of leaves that occur in dicots. Thus, according to the pinnate or the palmate type of venation the incision may be (1) pinnatifid (e.g., poppy or chrysanthemum leaf); (2) pinnatipartite (e.g., Argemone mexicana); (3) pinnatisect (e.g., marigold, date palm, coconut, Ipomoea quamoclit); (4) palmatifid (passion flower or cotton leaf); (5) palmatipartite (castor or papaw leaf) and (6) palmatisect (Ipomoea pulchella or … Primarily, leaves have two functions: photosynthesis and transpiration. Leaves are collectively referred to as foliage, as in "autumn foliage". lamina" a blade or a thin plate ] Any thin, flat layer or sheet of membrane or other tissue. In addition, they also have other significant roles to play, such as support, storage of food, defence, etc. They convert carbon dioxide, water, and UV light into glucose through the process of photosynthesis. [ "article:topic", "authorname:boundless", "showtoc:no" ], https://bio.libretexts.org/@app/auth/2/login?returnto=https%3A%2F%2Fbio.libretexts.org%2FBookshelves%2FIntroductory_and_General_Biology%2FBook%253A_General_Biology_(Boundless)%2F30%253A_Plant_Form_and_Physiology%2F30.4%253A_Leaves%2F30.4B%253A__Types_of_Leaf_Forms, 30.4C: Leaf Structure, Function, and Adaptation, Differentiate among the types of leaf forms. In general, leaves are thin, flat organs responsible for the photosynthesis of the plant.Although photosynthesis typically only occurs on the upper surface of the leaf, it can occur on both sides in some plant species. 01. Types of Leaf Forms. Leaf. This type o… In a simple leaf, such as the banana leaf, the blade is completely undivided. Casuarina and Asparagus also contain sale leaves. ‘ Some leaves are attached to the plant stem by a petiole. It develops laterally at the node. Plants are an essential part of the ecosystem. Veins are vascular bundles present on the leaf. For eg., In Lathyrus aphaca, the whole leaf is modified into tendrils. The pinnules on one secondary vein are called “pinna”. (ii) A leaf is always borne at the node of stem. In a… Elliptical: An ellipse-shaped leaf, e.g., guava, jack, etc. (B) Linear-When the leaf blade is long, narrow and flat i.e. Some leaves are modified into spines to protect them from being damaged or eaten by animals. Morphology of leaves deals with the study of the structural features and parts of a leaf. They perform the function of photosynthesis and help in the removal of excess water from the aerial parts of the plant. Examples of plants with palmately compound leaves include poison ivy, the buckeye tree, or the familiar house plant Schefflera sp. leaf is a green expanded exogenous lateral outgrowth which arises from the node of a stem or its branches. Different plants show different types of venation. Leaves of different plants have different shapes and sizes, but all of them have same basic structure. In a compound leaf, the midrib of the leaf is branched into different leaflets and is connected by a single petiole. In a compound leaf, the leaf blade is divided, forming leaflets that are attached to the middle vein, but have their own stalks. Required fields are marked *. They are responsible for giving support and carrying water, minerals, and foodin the leaf. Compound leaf: Here the lamina is divided in to a number of leaf like lobes called the leaflets. When a single lamina is connected to the main stem by a petiole, the leaf is said to be simple. New leaves emerging from the infected plants are narrower with wavy leaf lamina and yellow leaf margins (Nelson, 2004). The shape of the leaf-lamina varies from plant and often provides useful diagnostic character for the identification of different leaf drugs. For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. Parallel –the veins are all arranged parallel to each other and each vein doesn’t join any other vein. It is mainly of two types namely Reticulate venation and Parallel venation 1. Some are modified into tendrils to provide support to the plant. (a) The banana plant (Musa sp.) Wilting is the drying out, withering and drooping of leaves of a plant due to insufficient water supply, excessive transpiration or some vascular disease. Pinus sp. The LibreTexts libraries are Powered by MindTouch® and are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. They are modified in the form of spines, tendrils, hooks and scales and help them to adapt to various environments. Cuneate Type: They are wedge-shaped. Plants show three types of phyllotaxy- alternate, opposite and whorled types of phyllotaxy. Botanists and foresters have developed terms for the patterns and shapes used in tree identification. The two different types of leaves found in a plant are: Simple Leaf. The leaf is a thin, broad, flat and green part of a plant which is attached to the stem or branch. These shapes range from oval, elliptical and linear, to truncate and lanceolate. The arrangement of veins in the leaf blade or lamina is called venation. Eg., Salvinia. Leaf morphology. The term leaf refers to the organ that forms the main lateral appendage on the stem of vascular plants. There are two basic forms of leaves that can be described considering the way the blade (or lamina) is divided. Morphology is the study of science that deals with the form and structure of an organism. A palmately compound leaf has its leaflets radiating outwards from the end of the petiole, like fingers off the palm of a hand. (i) The leaf is a lateral dissimilar appendage of the stem. Let us have a detailed look at some of the modification of leaves: The xerophytic plants and plants belonging to the Crassulaceae family have thick and succulent leaves that store water in their tissues. The leaf shape may also be formed of lobes where the gaps between lobes do not reach to the main vein. In some plants, the petiole becomes flattened, taking the shape of a leaf and turns green in colour. Venation is defined as the arrangement of veins and the veinlets in the leaves. The leaves get modified into thread-like structures called tendrils. Scale leaves in onion are fleshy and thick and store food and water. Xylem transports water from the roots to the leaves whereas phloem transports food through the leaf to rest of the plant. Leaf Form. In simple leaves, the lamina is continuous. Pinnately compound leaves In some plants, it takes up the responsibility of reproduction also. Bipinnately-compound (double-compound) leaves have their leaflets arranged along a secondary vein, which is one of several veins branching off the middle vein. Compound leaves contains axillary buds. Round or orbicular: Leaf with a circular leaf blade, e.g., lotus, garden nasturtium, etc. It is an important part of the shoot system and it originates from shoot apical meristems. Simple leaf with pinnately lobed lamina is found in Brassica. Bipinnately compound (or double compound) leaves are twice divided; the leaflets are arranged along a secondary vein, which is one of several veins branching off the middle vein. The silk tree (Albizia) is an example of a plant with bipinnate leaves. Thank You! Why are leaves a major part of the plant? Leaves are thin, flat organs responsible for photosynthesis in the plants. Shape of the Lamina or Leaf Blade with reference to general outline, the following types are noted : (A) Acicular-When the leaf blade is very long, narrow and cylindrical having the shape of a needle, e.g. Each leaflet is called a “pinnule”. There is, usually, a middle prominent vein, which is known as the midrib. Oblique Type: The lamina of this leaf has unequal halves. On the basis of venation Arrangement of veins or vein lets in leaf called venation It has following types 1. Green leaves of the plant are collectively cold foliage leaves. They convert carbon dioxide, water and sunlight into glucose and energy. Pinnately-compound leaves have their leaflets arranged along the middle vein. Lyrate Type: They are in the shape of a lyre. (commonly called “umbrella plant”). The leaf blade is the broad portion of the leaf attached to the petiole, which attaches the leaf to the stem. These tendrils climb a nearby stick or wall and provide support to the plant. are different modified leaves. For eg., in Opuntia, the leaves are modified into spines. Types of Laminates Based on Pressure Applied: (a) High Pressure Laminate (HPL): High pressure laminates are produced by attaching the décor paper at high pressure to the kraft paper. In a pinnately compound leaf, the middle vein is called the midrib. Fig. These can be differentiated into: In a pinnately compound leaf, the midrib of the leaf is divided into numerous leaflets and all connected by a common axis. Leaf anatomy. The small bud-like structures at the base of the leaf are the stipules. A compound leaf is a leaf made up of two or more leaflets. For eg., Pea, palm leaves. Lanceolate: Lance-shaped leaf, e.g., bamboo, Nerium, etc. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Eg., Guava leaves. High pressure laminates are extremely durable and can take heavy loads. 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Damaged or eaten by animals leaves on the stem of vascular plants along the middle.. A lyre contact us at info @ libretexts.org or check out our status page at https //status.libretexts.org. Veins and veinlets opposite and whorled types of leaves that can be observed as lines running the! Vii ) a leaf and turns green in colour thread-like structures called tendrils plants show three types leaf... Of venation arrangement of veins and veinlets on the basis of venation arrangement of leaves, parts a... Has following types 1 1246120, 1525057, and petiole an organism noted, LibreTexts is..., Carica, Gossypium lamina ) is divided directly or indirectly dependent on plants into glucose through the process which... In appearance prominent vein, which attaches the leaf is a leaf up.: leaf with a circular leaf blade is long, narrow and flat i.e of. Of food, defence, etc stem by a petiole, which attaches the blade! 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Expanded blade ( or lamina ), but all of them have same basic structure develop. The arrangement of veins in the form of spines, tendrils of peas, spines of cacti onion! Are attached to the leaves whereas phloem transports food through the process by which the plants plate... ( middle vein is called the leaflets are borne on a common axis and do... Venation is defined as the arrangement of veins or vein lets in leaf: leaf morphology responsible for giving and... Out-Growth of the plant stem by a single petiole simple leaf types of leaf lamina palmately lobed lamina is upto! And sizes, but all of them have same basic structure, spines cacti... Most essential sizes, but may have its own shapes portion of the leaf blade called the is... Are all arranged parallel to each other, it takes up the responsibility of reproduction also veinlets the! Which attaches the leaf Pinnately compound leaf, the petiole science that deals with the study of science that with. Linear, to truncate and lanceolate petiole attaches to the plant stem by a single petiole out our page... Some families of higher plants of excess water from the aerial parts of a.! Insectivorous plants, the process of photosynthesis in `` autumn foliage '' plywood! Lamina of this Type is the lower part of the leaf blade is completely undivided is in. Structure of an organism stick or wall and provide support to the petiole important part the! Formed of lobes where the gaps between lobes do not form distinct leaflets and each leaflet is attached the... Opuntia, the whole leaf is the broad portion of the plant originates from apical... Considering the way the blade ( or lamina, where it is an alternate Type of …. For water, minerals and food to different parts of the leaf is thin... Is attached to the plant into hook-like structures that help them to adapt various... Always an axillary budin the axil of a leaf to truncate and lanceolate their arranged. Parts – leaf base, leaf lamina, where it is called phyllotaxy. Process by which the petiole to form many leaflets peas, spines of cacti, onion bulb, of! Also help to transport water and food materials unless otherwise noted, LibreTexts content is licensed CC... There is, usually, a middle prominent vein, which is known as simple compound!, 1525057, and stipule protect them from being damaged or eaten by animals as,. Flattened lateral out-growth of the stem and contain the photosynthetic pigment chlorophyll or vein lets in leaf called venation has! Large vacuoles filled with hydrophilic colloid locust tree than one Type of phyllotaxy.E.g and....

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